I bet a Fiat 500 is narrower
We've got one in the local car museum, it gets driven out and about every 18 months or so.
Crackin' fuel efficiency: https://en.wikipedia.org/wiki/Isetta
In every case I'd rather be in the Fiat 500. The only benefit might be the Model T attracting more attention, but some flashing lights and a garish "Road Maintenance" paint scheme could solve that for the Fiat.